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The post has rotted at ground level or was never set below the frost line. It is the posts that fail first almost every time, and replacing panels on failing posts is money spent twice.

Untreated wood moving with the seasons. Grey is only surface weathering and is cosmetic; splits that go through the board and cupping that pulls the fixings are structural and get worse each winter.

Usually the hinge post moving rather than the gate itself. The gate is the part of a fence used every day and the part built to the tightest tolerance, which is why it is the first thing to complain.

Wind loading on a solid fence is considerable, and it finds the weakest post. Worth checking the neighbouring posts at the same time -- the one that broke is rarely the only one that was going to.

A fence on the wrong side of a line is a legal problem, not a fencing one. The survey pins settle it; a hedge, an old fence line or a neighbour's memory do not.

The height stops a jumper, the gap at the bottom stops a digger, and the rail placement decides whether a climber can use it as a ladder. These are three different decisions and they are made before the material is chosen.

Privacy is a question of height, board spacing and where the fence sits relative to the sight line -- a shorter fence closer to the patio often screens better than a taller one at the boundary.

Pool barriers are governed by code rather than preference: height, the gap under it, the gap between verticals, and a self-closing self-latching gate with the latch above a set height. It is worth confirming locally before building.